diff --git a/paddle/fluid/operators/mkldnn/fc_mkldnn_op.cc b/paddle/fluid/operators/mkldnn/fc_mkldnn_op.cc
index 30db4b3be662b84f8146dd741f32e6fabf6c1874..a130db68a5816f31748c3a2863c144342b7f9ef0 100644
--- a/paddle/fluid/operators/mkldnn/fc_mkldnn_op.cc
+++ b/paddle/fluid/operators/mkldnn/fc_mkldnn_op.cc
@@ -178,6 +178,8 @@ class FCPrimitiveFactory {
     } else {
       out->set_format(in_format);
     }
+    out->set_mem_desc({phi::vectorize(out->dims()),
+                       platform::MKLDNNGetDataType<T_out>(), out->format()});
   }
 
   void UpdateDataPointers(const ExecutionContext& ctx, Tensor* out,